Gasoline Engine: No Power; Gasoline Engine Running Roughly - Champion 100379 Operator's Manual

100379 - FRONT TINE TILLER

Gasoline Engine: No Power

Problem
When increasing throttle, speed increase
slow (or even decreases and stops
running)/poor compression

Gasoline Engine Running Roughly

Problem
Knocking sound
Abnormal combustion
Spark plug
Cause
Air in fuel line or fuel line clogged.
Main oil flow hole is not adjusted
properly.
In carburetor, needle valve hole and
main oil flow hole clogged.
Fuel cock is clogged up.
Too much carbon deposit in combustion
chamber.
Too much carbon fouling in muffler and
exhaust pipe.
Air cleaner is clogged up.
Intake pipe is leaking.
Piston or cylinder or piston ring is worn.
Air leakage from the surface where
the cylinder block contacts the cylinder
head.
Too big or too small valve clearance.
Valve tightness is poor.
Cause
Piston, cylinder or piston ring is worn
excessively.
Piston pin and piston pin hole are worn
excessively.
Piston pin and piston pin hole are worn
excessively.
Roller bearing for crankshaft main shaft
is worn.
Engine is too hot.
Too much carbon deposit in combustion
chamber.
Improper gasoline brand or low gasoline
quality.
There is water in float chamber.
Improper spark plug electrodes
clearance.
Faulty spark plug.
TROUBLESHOOTING
Solution
Exhaust air or dredge fuel line.
Readjust.
Clean and blow to clear.
Clean/replace damaged part.
Clear away.
Clear away.
Clean air cleaner filter element.
Repair or replace.
Replace the worn part.
Replace cylinder gasket.
Readjust.
Repair.
Solution
Replace the worn part.
Replace piston or piston pin.
Replace tie rod.
Replace roller bearing.
Shut down and allow engine to cool off
before troubleshooting.
Clear away.
Replace with qualified gasoline.
Clean.
Adjust.
Replace spark plug.
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